ENGINE FUEL PUMP FLOW TEST
THIS WORK PACKAGE COVERS:
See your -10
Tools and Special Tools
General Mechanic's Tool Kit (WP 0541 00, Item 57)
Engine stopped (see your -10)
Carrier blocked (see your -10)
Power plant rear access door/panel removed
(see your -10)
Disconnect fuel return hose (1) and hold over suitable container.
(H) Start engine (see your -10). Run engine at 1200 rpm.
Measure fuel return flow for one minute. Fuel return flow should be about 1/2 gallon per minute (2 lpm).
Put end of fuel return hose (1) into container of fuel. If air bubbles appear on the surface, there is an air leak on the
suction side of the engine fuel pump. Tighten fuel hose connections.
If no air bubbles rise to the surface and fuel flow is not enough for good engine operation, replace primary fuel filter
Measure fuel flow, see Step 2 and Step 3. If fuel flow is not enough for good engine operation, replace secondary fuel
Measure fuel flow, see Step 3.